fix(mdPanel): fix error when opening a previously closed panel
fix(mdPanel): fix error when opening a previously closed panel

Ensures the `_removeListeners` collection is reset with a new array literal instead of null.

Closes #8894

Closes #8895

clshortfuse/material,SamDLT/material,j3ski/material,DevVersion/material,gkalpak/material,ServiceManagementGroup/material,david-gang/material,Splaktar/material,Splaktar/material,clshortfuse/material,ServiceManagementGroup/material,vertazzar/material,clshortfuse/material,crisbeto/material,miguelcobain/material,Frank3K/material,clshortfuse/material,marekmicek/material,SamDLT/material,imjoeco/material,welkinhealth/material,ilovett/material,oostmeijer/material,pwistbac/material,oostmeijer/material,bluebirdtech/material,imjoeco/material,imjoeco/material,SamDLT/material,crisbeto/material,profoundry-us/material,angular/material,bluebirdtech/material,hayloft/material,ilovett/material,welkinhealth/material,DevVersion/material,crisbeto/material,Splaktar/material,ilovett/material,Frank3K/material,profoundry-us/material,ServiceManagementGroup/material,profoundry-us/material,angular/material,david-gang/material,vertazzar/material,vertazzar/material,j3ski/material,miguelcobain/material,gkalpak/material,crisbeto/material,marekmicek/material,pwistbac/material,SamDLT/material,vertazzar/material,bluebirdtech/material,marekmicek/material,daniel-nagy/material,welkinhealth/material,DevVersion/material,angular/material,oostmeijer/material,daniel-nagy/material,graingert/material,hayloft/material,welkinhealth/material,ServiceManagementGroup/material,miguelcobain/material,angular/material,j3ski/material,gkalpak/material,david-gang/material,imjoeco/material,miguelcobain/material,daniel-nagy/material,pwistbac/material,graingert/material,david-gang/material,daniel-nagy/material,graingert/material,oostmeijer/material,Frank3K/material,hayloft/material,j3ski/material,marekmicek/material,ilovett/material,Frank3K/material,Splaktar/material,pwistbac/material,profoundry-us/material,graingert/material,gkalpak/material,DevVersion/material,hayloft/material,bluebirdtech/material